From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from m12-16.163.com ([220.181.12.16]:39457 "EHLO m12-16.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750869AbdEaKHj (ORCPT ); Wed, 31 May 2017 06:07:39 -0400 From: Jia-Ju Bai To: Larry.Finger@lwfinger.net, kvalo@codeaurora.org Cc: linux-wireless@vger.kernel.org, b43-dev@lists.infradead.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jia-Ju Bai Subject: [PATCH] b43legacy: Fix a sleep-in-atomic bug in b43legacy_op_bss_info_changed Date: Wed, 31 May 2017 18:09:13 +0800 Message-Id: <1496225353-5544-1-git-send-email-baijiaju1990@163.com> (sfid-20170531_120812_833675_E8D683EB) Sender: linux-wireless-owner@vger.kernel.org List-ID: The driver may sleep under a spin lock, and the function call path is: b43legacy_op_bss_info_changed (acquire the lock by spin_lock_irqsave) b43legacy_synchronize_irq synchronize_irq --> may sleep To fix it, the lock is released before b43legacy_synchronize_irq, and the lock is acquired again after this function. Signed-off-by: Jia-Ju Bai --- drivers/net/wireless/broadcom/b43legacy/main.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/wireless/broadcom/b43legacy/main.c b/drivers/net/wireless/broadcom/b43legacy/main.c index f1e3dad..31ead21 100644 --- a/drivers/net/wireless/broadcom/b43legacy/main.c +++ b/drivers/net/wireless/broadcom/b43legacy/main.c @@ -2859,7 +2859,9 @@ static void b43legacy_op_bss_info_changed(struct ieee80211_hw *hw, b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_MASK, 0); if (changed & BSS_CHANGED_BSSID) { + spin_unlock_irqrestore(&wl->irq_lock, flags); b43legacy_synchronize_irq(dev); + spin_lock_irqsave(&wl->irq_lock, flags); if (conf->bssid) memcpy(wl->bssid, conf->bssid, ETH_ALEN); -- 1.7.9.5